This technical manual provides comprehensive information for the John Deere 1640, 1840, 2040, and 2040S tractors. These agricultural machines are known for their robust engineering and reliability, designed to meet a variety of demanding tasks. The manual details their specifications, operational procedures, and maintenance requirements, serving as an essential resource for ensuring optimal performance and longevity. The purpose of this manual is to offer detailed guidance for the maintenance, diagnosis, and repair of these John Deere tractor models. It covers a wide array of systems, including the engine, fuel and air intake, electrical, power train, steering and brakes, and hydraulic systems. Additionally, it provides information on the operator's cab, special tools, and pre-delivery procedures. This resource is intended for owners, mechanics, and technicians seeking to maintain and repair their equipment effectively.